Ok, your from the US of A so excited marketing etc will be natural. Read on.
There is a game from Reiza studio's called Stock Car EXTREME !!!. Stupid name but still a pretty good game that allows modding of cars/tracks etc. Good AI, lots of cars etc, been racing a
Formula V round
Pukekohe classic most of the holidays, so, there is a mod for this game which is your CART class you want. This is 1998, close enough.
The current game is based on rFactor 1, with mega tweaking, new game, look up for yourself cus New Years and........
The mod's called Cart EXTREME !!!, downloadable
here, tracks are
here, Game is
here on steam, cost's $27 NZ atm (about $1 US of A) and if you buy before 6 Jan you get the new game release free.
About the same price as Rockingham.........., ( Which is a free download here) Yes, well,......., So, how can you not buy 2 games, mods, etc for that price ?
Watch and enjoy
https://www.youtube.com/watch?v=BNrI7HTSvqg
Different track but here's the V
https://www.youtube.com/watch?v=meexgj114F0
And this is another good V example,
https://www.youtube.com/watch?v=ZZmTQQOqjXc
It also has a pretty good Aussi/Kiwi V8 mod, not being finished atm cus bitchin, but whats there is good.
https://www.youtube.com/watch?v=ihDVZcuINss
Inside Sim Racing give this game a 9/10 AFTER ripping on it's graphics, 10 year old engine etc !